The entire Eizouken counts, as they sell their work and make plenty of profit (even though Asakusa and Mizusaki only care about the animation), but this especially applies to Kanamori, who has been finding ways to make money since she was very young.

Comic Books

DC Comics had The Green Team, a short-lived group of kids whose careers had made them millionaires (trillionaires in the millennium reboot).

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Comic Strips

Manolito in Mafalda. Played with a fair bit more realism in that he is usually seen helping his dad run the family grocery store and is often seen interacting with the customers, managing the items and occasionally resorting to hilariously cheap tactics to try and promote the store, all with the goal of becoming a supermarket mogul as an adult.

Lucy from Peanuts is one of the older examples of this trope. She's been selling psychiatric advice to Charlie Brown, whether he wants it or not, since 1959.

There's an executive boardroom scene in Hudson Hawk that includes a kid who is presumably one of these.

Dobbs, one of the bullies from Max Keeble's Big Move, has this as his background: he was a millionaire at twelve but lost everything in the stock market, so now he steals lunch money on the pretense he's "investing" it.

The Richie Rich movie has its eponymous character taking over the family corporation while his parents are missing and presumed dead (by everyone but him). He carries on with his dad's tradition of being an Honest Corporate Executive.

There is a charming Scottish short film from 1981 called The Dollar Bottom, which is about a boy in boarding school who sets up a business and makes a fortune insuring his peers against corporal punishment.

Literature

From the Ring of Fire short stories, the Barbie Consortium is founded by a group of uptime pre-teen girls, inspired by their older siblings to become investors. The group's name comes from the original source of income, selling of uptime Barbie dolls to the people of the 17th century Germany into which their town has been transported.

Artemis Fowl. Teenage billionaire evil genius. Learned everything he knows from his ruthless father, though as time goes by, both Fowl men are less on the evil end of the spectrum.

Artie in Gordan Korman's No Coins, Please comes up with entrepreneur schemes in every state the group hits. Heck, he starts a cow milking business!

Chichikov in Dead Souls. He starts by creating a wax bird and selling it to a classmate, for the money he gets he buys food and sells it to hungry students, and so on.

Subverted in one episode. Magnum is hired for security for the "vast holdings" of a teenage Cattle Baron. As it turns out it is a con, and the "vast holdings" are rather skinny. But he did do a good job of taking care of his birthright such as it was.

An episode of Law & Order has a minor witness who owned a nightclub circuit where a shooting took place. A 16-year-old prep school student, he came to the interview armed with a Blackberry and a cutthroat business plan that he explained to the dubious detectives: He doesn't own a permanent property, but instead rents various locations on a night-by-night basis, paying for just enough renovations to bring them up to code as needed. By renting, he eliminates most of the overhead and down profit time of keeping his club open on unprofitable weeknights. Paid admission is handled by bouncers at the door, while drinks are served (for typically insane prices) by an automatic dispenser that eliminates spills and free drinks from bartenders, to say nothing of having to pay the bartenders themselves. All the permits, licenses, and such are handled by an older friend/business partner.

The sourcebook Runner Havens has a kid in Hong Kong who runs a very popular noodle stand known as "Noodleboy's". According to one of the hackers, the kid's also a money-launderer for one of the Hong Kong Triads.

During the Crash 2.0, a teenager working part-time at a Stuffer Stack fast food restaurant managed, by accident, to place a stock order for Shiawase at the exact millisecond the Crash caused the stock price to plummet for nanopennies on the dollar. By the time the Crash's aftereffects sorted themselves out, he found himself owning over 4% of one of the largest corporations on the planet. This technically makes him a millionaire on a grand scale, but also puts him way over his head as a major deciding vote between two separate factions of the family-run company, both of whom want him to support their agenda or sell his shares to him. Or else.

Video Games

Malo, the huge fore-headed kid from The Legend of Zelda: Twilight Princess who looks like an infant, turns out to be a ruthless and savvy businessman when he takes over the shop in the Goron village and later the Castle Town shop.

Sheng Kawolski in Fallout 4 is a savvy young purified water salesman in Diamond City.

Potentially possible in Pokémon Black 2 and White 2. When you get control of Join Avenue, an NPC may ask to open a shop there. Some of the possible entrepeneurs looking to start a business include Youngsters, Lasses or even Preschoolers. So, yeah, that Market where you can buy bulks of otherwise very rare items like Max Revives and PP Up? Run by a five year old kid.

South Park: Cartman was revealed to be this in "My Future Self and Me" Later his future version appears and reveals that, once he changes his lifestyle, he will become a rather successful businessman. He refuses, and future!Cartman immediately becomes a slovenly plumber.

Phineas and Ferb: Phineas and Ferb often cross into this territory — although it's often more of an Informed Ability, since they don't keep the money themselves.

My Little Pony: Friendship Is Magic: In his latest appearances in the show, Snips is often seen trying to make a quick buck, most usually by selling Buckball paraphernalia, surfing on Snails' success with the sport.

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